Gear-generating machine.



E. PELLOWS.

'E GENERATING MACHINE.

APPLIGATION FILED APR. 2, 1909.

' Patentsd Jan. 24, 1911.

4 SHEETS-SHEET 1.

E. R. FELLOWS.

GEAR GENERATING MACHINE.

APPLICATION FILED ML2, 1909.

Patented J an. 24

E. R. FBLLWS.

GEAR GENERATING MACHINE.

APPLICATION FILED APRJZ, 1909.

Patemed Jan, 2%, 1911.

I, SHEETS-SHEET 3.

'13. R. PELLOWS. GEAR GBNERATING MACHINE.

APPLICATION FILED APILZ, 1909.

982,581. Patented Jan. 24,1911.

4 SHEETS-SHEET 4.

lToall whom 'it may ooncem: i

have devised a machine similar nnrrisn -sfrarns rATENT ernten, A

BYIN FELIZ-OWS, DSPBINGFIELD, VERMONT, ASSIGNOR T0 STONE-PROBST AXLE- COMPANYSOI SOLUMBUS, OHIO, A. CORPORATION 0F OHIO.

GEAnfGENERATING iviaoirmn.

Specification of Letters Patent.

Patented J 1111.24, 1911.

Application led April 2, 1909. Serial No. 487,521.

Be itknovvn 4that I, EDWIN R. FenLows,

" of. Springield, in the county of Windsor and .State of Vermont, have invented certain new and useful Improvements in Gear-Generating'Machiiies, of which the following is a specification.

This invention relatesto gearfgenerating machines of the general character described 'in my prior Patents No. 579,708, granted March 30, 1897, and No. 879,531, granted February 18, 1908, for planing the teeth on gears and thelike by the generating system,

`in which 'a gearfsh'aped cutter is employed l to actin the manner of a planing or shaping tool en work, end is rotated in conjunction with the work to give a feed movement simi- 'la-r'to. that 'of intermeshing gears, so that the curves of the teeth formed on `the blank may be generated, of a form adapting them to mesh properly with gears having teeth I `similar 'in pitcli'and shape to those of the cutter. l

The object ofithegpresent inventionl to provide a machine working on this principle,` adapted to generate the teeth o l crown gears or. gears of .like nature, in which the teeth project in an'axial direction trom 'a face thereof, instead of from the periphery or rim of the gear.

In carrying my invention into nell'ect, l

its gcneral nature to that illustratedan atent i\o.

(879,531, above referred to, but-A iodiiied so as to be adapted to hold a gehn" blank with' its axis extending transversely.- of the axis ofthe cutter, i'nstea'd of approximately parallel therewith, as in the case of my prior inventions.l The gear blank is thus held so that its plane is approximately parallel with the path in which the cutter reciprocates, so that the latter travels across the tace of the disk and cuts teeth inA such face or ii a circular rib projecting axially from the face.

' Ot the accompany-ing diawings,-l `igure 1 represents a front elevation of a gear-gcnerating machine embodying lmy present invention. Fig. 2 is a side elevation as seen from the right of Fig. l. Fig. 3 is a lefthand side elevation. .Eig 4 is a vertical section of the work holder, cutter and feeding mechanism. Fig: tlshows an elevation of the work-holding slide, of the actuating mechanism associated therewith, the gear 55 blank, and a sectional view of the cutter.

Fig. 6 is an elevation of a portion of a gear,

illustrating the character of the work peron lines T- and S-S rcspectively,of Fig. 6. 60

The same reference characters indicate the salue parts in all the figures.

'l`he general construction of the machine is similar to that of Patent No. 879,531, before referred to. llence only those parts which have been constructed andarranged dillerently from what is" shown in the said patent, in 4order to accomplish the new result desired, need to be here specifically described. -i

'lh'e cutter is'representcd at 1 and is made iii-the shape of a gear having radial gear shaped cutting teeth, as in my prior'patents. This cutter is mounted upon a spindle 2 which is given a reciprocative movement for cutting, and a' rotative movement for generating the curves of the teeth on the work.-

'The work is represented as a disk-like blank 3 clamped toa holder t by a clamping plate 5-and l.a nut 6 (sec Fig. 45).: This holder, togcth n with the' clamp and nut, is carried by a' work spindle 7 mounted rotatively in aslidel S, said slide being, as shown in F ig. 4, arrangedrto travel on aguide t) formed Von the hase 1Q, ot. the machine.

'lhe cutter and work are progressively rotate-din nn'ison,tlie means for thus rotating or indexing the blankbeing avworm wheel 1l secured to the work spindle 9,`and a worm l2 carried by a shaft section 13. 'l.`his,worm

shaft has upon it a bevel gear. llt'which meshes with a gear l5 `on the feed rod 16, said rod receiving its motion from a shaft l? through changegem's 18 19 20 and 21,

the latter being driven by a bevel gear 22 on the shaft 17. V'.lhis shaft receives its motion l'rom the main counter-shaft 2 3, to which power for operating the machine is delivered through the pulleys .24 and 25,

amcaused to rotate slowlyin exact unison. 1]

l i i The guideways for the slide. 8 extend transversely of the cutter spindle s0 that the work may be brought up to the cutter when the cutting operation is begun.y to get thepioper depth leed. For tlnis feeding the workholding slide and the work there is provided a feed screw 33 upon which is threaded a nut t' having integral\therewith,

tl gear 3i. This gear is operated by a pinion 3S with which is connected a ratchet 39 operated by a pawl tO. The pawl is connected to an arm 41 carried by a rock shaft journaled in a. bracket 472, am' haring a second arm 43 engaged with a camion the back of a gear-t4, as in the maehitte. shown in Patent No. 879,531, before referred to.' Gear 44 is driven by a pinion 4:3' on the counter-shaft 3. 'l`lie step-b,\'-step motion lthus given by the pawl 4t) slowly turns the nut 3G, and, the serew 35 being-held against rotation, thus the slide is slowly drawn toward the cutter. lliun-l-l'eed ot the work is accomplished by a crank applied to a crank-shaft t6 having a worm -lT which meshes with a worm wheel 4b on a nut- -ltt engaged with thel screw 35 within thebase ofthe machine. f

.\s has-previously been said, the cutter spindle is reeiproeated in order to'enable the cutter to plane grooves inthe gear blank. 'l`he mechanism t'or 'reciprocating the cutter is not herein illustrated, but. it is the same as, or equivalent to. that .shown in Patent-No Sithil. as are also ll details of the mechanism t'or indexingr tlie cutter-andother details'ot construction and operating parts which are not particularly shown or referred 'to herein, l"or .such details, attention is di` ret-lcd to the said latent No. $9,531. w.

Figs. t .i and H illustrate the form of teeth eut on a erown gear by a machine of this eh.|raeter. 'l`lie bottoms a. of the grooves or notches between the teeth are ot' equal width throughout, owing to their being formed by the outer ends of the planing cut- 'l`he eIl't-et ol the rotation of the cutter and blank in intersecting planes is to give the sides and outer faces ot the teeth anabnorinal shape. thesides e Lliating a 4.steeper inclination at their inner endsthau at their outer ends, in consequence Yof which the laces e ot' the teeth are of diminishing width from their inner to their outerjeiids. ln consequence ot' tbe abnormal forni thus girenvthe teetli ol' the crown gear, they are adapted to mesh properly. with a spur gear or pinion `tnounted to rotatcin a platte trai-isverse to that oll the crown gear, for the enlargement otthe tooth spaees'lat.4 .t-heir outer ends enables a sort of relative rolling motion between the teeth, about anaxis perpendicular to the pitch plane of the crown gear teeth, to take place; the spur gear .teeth being able to enter and leave, lthe coinple mental tooth spaces- 'freely and without binding.

titled with a plurality o I claimr- A l. A machine for generating ears with teeth formed in a side face thereon?, comprising a rotatable blank support, a rotatable tool provided with a cutting element, the axis of said tool being arranged at, an an le to the axis of the blank support, means or reciprocating said tool in a direction toward and from the center of the blank, and means for rotating the tool during the reciprocatioii thereof` and intime with the rotatiqnof said blank support, whereby the s aces be# tween the teeth foi-ined on the bank are wider at. the outer ends than attlie inner ends.

2. A machine for generating gears with teeth formed on a side facethereof, comprising'a rotatable blank su port, a tool proi) cutting elements arranged in a circular series, the axis of said tool being at an angleA to the axis of theblank support, means for reciprocatin the cuttingeleineuts in a direction towar and A from the center of .said blank', and means -fol' rotating said tool to shiftlthe 'cuttingjelements laterally iii unison withthe rotation of said blank, whereby the spaces between the teeth `formed on the blank are wider at the outer ends than at the inner ends.

j 3. A gear generating machine comprising a blaiik-supporting spindle, means for rotating the same, a cutter spindle, said spindles being arranged at. approxii'nately right angleil to one another, means v.forfsecuring a gear blank to said supporting spindle transvers-ely'thereof. a planing cuttercarried by said cutter spindle, means -for reciprocating said spindle Ato carry the cutterjn a direction toward and from the vcenter of t-he blank. and means for rotatingsaid cutter .spindle to shift `the cartel-'laterally in tini- .fon with the rotation of said blank-supporting spindle. whereby the spaces .betweeibthe teeth formed ou the blank are, wider atthe' outer endsl than at the inner ends.

-l. A gear generating machine comprising a blank -supporting spindle, means for rotat;- ingthe same, a cutter spindle rovided with a plurality of cutters arrange in acircular p series.` said spindles being arranged at ap-` proximately. right angles to one `another, means for securing a gear blank to said Supportingr spindle transverselythereof, a Iplaning cutter carried by said-cutter spindle, means for reciprocating said spindle to carry the cutter in a direction toward and from the center of the blank, and means for rotating said cutter spindle` Atoshift the cutters laterally in unison with the rotation of said blank supporting spindle, whereby the spaces between the teeth formed on the blank are wider at the outer ends than at the inner ends. f

5..A crowngearshaping machine com-` prising u planing cutter having a circularseries of ,radial cutter teeth mounted and driven to travel reciproeatively in av path approximately coincident with its axis, a blank-supporting spindle arranged transverse] y of the path of travel of said cutter, a blank holder carried by said spindle and constructedto hold a crown gear blank coaxially of the spindle, a slide in which said Spindle is mounted rotatively, said slide being movable toward and from the line of travel of the cutter to feed the work, and means for rotating said spindle, and means for rotating said cutter to shift the l'cutter teeth laterally in unison with the rotation of said spindle, whereby the spaces between the teeth, formed on the blank are wider at the outer ends than at the inner ends.

(l. A inachine for generating the teeth of cron-n wheels and .gears of like nature, comprising a work-supporting slide, a Work spindle mounted rotatively upon said slide, a blank holder carried by said spindle and constructed tovsecnre a blank coaxially of the spindle, a rotative and reciprocative cutter spindle, a planing cutter havingk radial gearformed cutter teeth carried by Said spmdle and arranged to plane the Work by movexnents lin the general direction of its axis,

said s ,indles being arranged at suchan angle re atively to each Vother that the cutter is caused to reciprocate across the face of the blank, Worm and wheel gearings for rotating each of said spindles, said cutter,` spindle being rotated during its reci rocation to shift Vthe cutter teeth laterally, -W ereby the s aces between the teeth formed on the blan are Wider at the outer ends'than" at the inner ends, common driving mechanism for both of said lEgearimigfs, whereby the ctter and blank are'indexed in unison, and feed mechanisrn for said slide by which the'blank is fed up to the cutter.v

lin-testimony whereof l. have atxed. my signature, in presence of two witnesses.

, EDWN 5R, FELLOWS." 1lll'l'itnesses E. J. FULLAM, i

ALICE M. WrrnELnn. 

